"use client";

import * as React from "react";
import {
  DndContext,
  KeyboardSensor,
  MouseSensor,
  TouchSensor,
  closestCenter,
  useSensor,
  useSensors,
  type DragEndEvent,
  type UniqueIdentifier,
} from "@dnd-kit/core";
import { restrictToVerticalAxis } from "@dnd-kit/modifiers";
import {
  SortableContext,
  arrayMove,
  useSortable,
  verticalListSortingStrategy,
} from "@dnd-kit/sortable";
import { CSS } from "@dnd-kit/utilities";
import {
  flexRender,
  getCoreRowModel,
  getFilteredRowModel,
  getPaginationRowModel,
  getSortedRowModel,
  useReactTable,
  type ColumnDef,
  type ColumnFiltersState,
  type Row,
  type SortingState,
  type VisibilityState,
} from "@tanstack/react-table";
import {
  CheckCircle2Icon,
  ChevronDownIcon,
  ChevronLeftIcon,
  ChevronRightIcon,
  ChevronsLeftIcon,
  ChevronsRightIcon,
  ColumnsIcon,
  GripVerticalIcon,
  LoaderIcon,
  MoreVerticalIcon,
  PlusIcon,
} from "lucide-react";
import { z } from "zod";

import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Checkbox } from "@/components/ui/checkbox";
import {
  DropdownMenu,
  DropdownMenuCheckboxItem,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import { Label } from "@/components/ui/label";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";

export const schema = z.object({
  id: z.union([z.string(), z.number()]),
  header: z.string(),
  type: z.string(),
  status: z.string(),
  target: z.string(),
  limit: z.string(),
  reviewer: z.string(),
  href: z.string().optional(),
});

export type DataTableRow = z.infer<typeof schema>;

function DragHandle({ id }: { id: UniqueIdentifier }) {
  const { attributes, listeners } = useSortable({ id });

  return (
    <Button
      {...attributes}
      {...listeners}
      variant="ghost"
      size="icon"
      className="size-7 text-muted-foreground hover:bg-transparent"
    >
      <GripVerticalIcon className="size-3 text-muted-foreground" />
      <span className="sr-only">Drag to reorder</span>
    </Button>
  );
}

function DraggableRow({ row }: { row: Row<DataTableRow> }) {
  const { transform, transition, setNodeRef, isDragging } = useSortable({
    id: row.original.id,
  });

  return (
    <TableRow
      data-state={row.getIsSelected() && "selected"}
      data-dragging={isDragging}
      ref={setNodeRef}
      className="relative z-0 data-[dragging=true]:z-10 data-[dragging=true]:opacity-80"
      style={{
        transform: CSS.Transform.toString(transform),
        transition,
      }}
    >
      {row.getVisibleCells().map((cell) => (
        <TableCell key={cell.id}>
          {flexRender(cell.column.columnDef.cell, cell.getContext())}
        </TableCell>
      ))}
    </TableRow>
  );
}

const columns: ColumnDef<DataTableRow>[] = [
  {
    id: "drag",
    header: () => null,
    cell: ({ row }) => <DragHandle id={row.original.id} />,
    enableSorting: false,
    enableHiding: false,
  },
  {
    id: "select",
    header: ({ table }) => (
      <div className="flex items-center justify-center">
        <Checkbox
          checked={
            table.getIsAllPageRowsSelected() ||
            (table.getIsSomePageRowsSelected() && "indeterminate")
          }
          onCheckedChange={(value) => table.toggleAllPageRowsSelected(!!value)}
          aria-label="Select all"
        />
      </div>
    ),
    cell: ({ row }) => (
      <div className="flex items-center justify-center">
        <Checkbox
          checked={row.getIsSelected()}
          onCheckedChange={(value) => row.toggleSelected(!!value)}
          aria-label="Select row"
        />
      </div>
    ),
    enableSorting: false,
    enableHiding: false,
  },
  {
    accessorKey: "header",
    header: "Header",
    cell: ({ row }) => (
      <span className="font-medium">{row.original.header}</span>
    ),
    enableHiding: false,
  },
  {
    accessorKey: "type",
    header: "Section Type",
    cell: ({ row }) => (
      <div className="w-32">
        <Badge variant="outline" className="px-1.5 text-muted-foreground">
          {row.original.type}
        </Badge>
      </div>
    ),
  },
  {
    accessorKey: "status",
    header: "Status",
    cell: ({ row }) => (
      <Badge
        variant="outline"
        className="flex w-fit gap-1 px-1.5 text-muted-foreground [&_svg]:size-3"
      >
        {row.original.status === "Done" || row.original.status === "Active" ? (
          <CheckCircle2Icon className="text-green-600 dark:text-green-400" />
        ) : (
          <LoaderIcon />
        )}
        {row.original.status}
      </Badge>
    ),
  },
  {
    accessorKey: "target",
    header: () => <div className="w-full text-right">Target</div>,
    cell: ({ row }) => (
      <div className="text-right tabular-nums">{row.original.target}</div>
    ),
  },
  {
    accessorKey: "limit",
    header: () => <div className="w-full text-right">Limit</div>,
    cell: ({ row }) => (
      <div className="text-right tabular-nums">{row.original.limit}</div>
    ),
  },
  {
    accessorKey: "reviewer",
    header: "Reviewer",
    cell: ({ row }) => {
      const isAssigned = row.original.reviewer !== "Assign reviewer";
      if (isAssigned) {
        return row.original.reviewer;
      }
      return (
        <Select>
          <SelectTrigger className="h-8 w-40" id={`${row.original.id}-reviewer`}>
            <SelectValue placeholder="Assign reviewer" />
          </SelectTrigger>
          <SelectContent align="end">
            <SelectItem value="eddie">Eddie Lake</SelectItem>
            <SelectItem value="jamik">Jamik Tashpulatov</SelectItem>
          </SelectContent>
        </Select>
      );
    },
  },
  {
    id: "actions",
    cell: ({ row }) => (
      <DropdownMenu>
        <DropdownMenuTrigger asChild>
          <Button
            variant="ghost"
            className="flex size-8 text-muted-foreground data-[state=open]:bg-muted"
            size="icon"
          >
            <MoreVerticalIcon />
            <span className="sr-only">Open menu</span>
          </Button>
        </DropdownMenuTrigger>
        <DropdownMenuContent align="end" className="w-40">
          {row.original.href ? (
            <DropdownMenuItem asChild>
              <a href={row.original.href}>Open</a>
            </DropdownMenuItem>
          ) : (
            <DropdownMenuItem>Edit</DropdownMenuItem>
          )}
          <DropdownMenuItem>Make a copy</DropdownMenuItem>
          <DropdownMenuItem>Favorite</DropdownMenuItem>
          <DropdownMenuSeparator />
          <DropdownMenuItem className="text-destructive focus:text-destructive">
            Delete
          </DropdownMenuItem>
        </DropdownMenuContent>
      </DropdownMenu>
    ),
  },
];

export function DataTable({
  data: initialData,
  addHref,
  addLabel = "Add Section",
  tabs,
}: {
  data: DataTableRow[];
  addHref?: string;
  addLabel?: string;
  tabs?: { value: string; label: string; badge?: number }[];
}) {
  const [data, setData] = React.useState(() => initialData);
  const [rowSelection, setRowSelection] = React.useState({});
  const [columnVisibility, setColumnVisibility] =
    React.useState<VisibilityState>({});
  const [columnFilters, setColumnFilters] = React.useState<ColumnFiltersState>(
    [],
  );
  const [sorting, setSorting] = React.useState<SortingState>([]);
  const [pagination, setPagination] = React.useState({
    pageIndex: 0,
    pageSize: 10,
  });
  const sortableId = React.useId();
  const sensors = useSensors(
    useSensor(MouseSensor, {}),
    useSensor(TouchSensor, {}),
    useSensor(KeyboardSensor, {}),
  );

  React.useEffect(() => {
    setData(initialData);
  }, [initialData]);

  const dataIds = React.useMemo<UniqueIdentifier[]>(
    () => data.map(({ id }) => id),
    [data],
  );

  const table = useReactTable({
    data,
    columns,
    state: {
      sorting,
      columnVisibility,
      rowSelection,
      columnFilters,
      pagination,
    },
    getRowId: (row) => String(row.id),
    enableRowSelection: true,
    onRowSelectionChange: setRowSelection,
    onSortingChange: setSorting,
    onColumnFiltersChange: setColumnFilters,
    onColumnVisibilityChange: setColumnVisibility,
    onPaginationChange: setPagination,
    getCoreRowModel: getCoreRowModel(),
    getFilteredRowModel: getFilteredRowModel(),
    getPaginationRowModel: getPaginationRowModel(),
    getSortedRowModel: getSortedRowModel(),
  });

  function handleDragEnd(event: DragEndEvent) {
    const { active, over } = event;
    if (active && over && active.id !== over.id) {
      setData((rows) => {
        const oldIndex = dataIds.indexOf(active.id);
        const newIndex = dataIds.indexOf(over.id);
        return arrayMove(rows, oldIndex, newIndex);
      });
    }
  }

  const viewTabs = tabs ?? [
    { value: "outline", label: "Outline" },
    { value: "past-performance", label: "Past Performance", badge: 3 },
    { value: "key-personnel", label: "Key Personnel", badge: 2 },
    { value: "focus-documents", label: "Focus Documents" },
  ];

  return (
    <Tabs
      defaultValue={viewTabs[0]?.value ?? "outline"}
      className="flex w-full flex-col justify-start gap-6"
    >
      <div className="flex items-center justify-between gap-2">
        <TabsList className="flex">
          {viewTabs.map((tab) => (
            <TabsTrigger key={tab.value} value={tab.value} className="gap-1">
              {tab.label}
              {typeof tab.badge === "number" ? (
                <Badge
                  variant="secondary"
                  className="flex h-5 w-5 items-center justify-center rounded-full bg-muted-foreground/30"
                >
                  {tab.badge}
                </Badge>
              ) : null}
            </TabsTrigger>
          ))}
        </TabsList>
        <div className="flex items-center gap-2">
          <DropdownMenu>
            <DropdownMenuTrigger asChild>
              <Button variant="outline" size="sm">
                <ColumnsIcon />
                <span className="hidden lg:inline">Customize Columns</span>
                <span className="lg:hidden">Columns</span>
                <ChevronDownIcon />
              </Button>
            </DropdownMenuTrigger>
            <DropdownMenuContent align="end" className="w-56">
              {table
                .getAllColumns()
                .filter(
                  (column) =>
                    typeof column.accessorFn !== "undefined" &&
                    column.getCanHide(),
                )
                .map((column) => (
                  <DropdownMenuCheckboxItem
                    key={column.id}
                    className="capitalize"
                    checked={column.getIsVisible()}
                    onCheckedChange={(value) => column.toggleVisibility(!!value)}
                  >
                    {column.id}
                  </DropdownMenuCheckboxItem>
                ))}
            </DropdownMenuContent>
          </DropdownMenu>
          {addHref ? (
            <Button asChild variant="outline" size="sm">
              <a href={addHref}>
                <PlusIcon />
                <span className="hidden lg:inline">{addLabel}</span>
              </a>
            </Button>
          ) : (
            <Button variant="outline" size="sm">
              <PlusIcon />
              <span className="hidden lg:inline">{addLabel}</span>
            </Button>
          )}
        </div>
      </div>
      <TabsContent
        value={viewTabs[0]?.value ?? "outline"}
        className="relative flex flex-col gap-4 overflow-auto"
      >
        <div className="overflow-hidden rounded-lg border">
          <DndContext
            collisionDetection={closestCenter}
            modifiers={[restrictToVerticalAxis]}
            onDragEnd={handleDragEnd}
            sensors={sensors}
            id={sortableId}
          >
            <Table>
              <TableHeader className="sticky top-0 z-10 bg-muted">
                {table.getHeaderGroups().map((headerGroup) => (
                  <TableRow key={headerGroup.id}>
                    {headerGroup.headers.map((header) => (
                      <TableHead key={header.id} colSpan={header.colSpan}>
                        {header.isPlaceholder
                          ? null
                          : flexRender(
                              header.column.columnDef.header,
                              header.getContext(),
                            )}
                      </TableHead>
                    ))}
                  </TableRow>
                ))}
              </TableHeader>
              <TableBody>
                {table.getRowModel().rows?.length ? (
                  <SortableContext
                    items={dataIds}
                    strategy={verticalListSortingStrategy}
                  >
                    {table.getRowModel().rows.map((row) => (
                      <DraggableRow key={row.id} row={row} />
                    ))}
                  </SortableContext>
                ) : (
                  <TableRow>
                    <TableCell
                      colSpan={columns.length}
                      className="h-24 text-center"
                    >
                      No results.
                    </TableCell>
                  </TableRow>
                )}
              </TableBody>
            </Table>
          </DndContext>
        </div>
        <div className="flex items-center justify-between px-1">
          <div className="hidden flex-1 text-sm text-muted-foreground lg:flex">
            {table.getFilteredSelectedRowModel().rows.length} of{" "}
            {table.getFilteredRowModel().rows.length} row(s) selected.
          </div>
          <div className="flex w-full items-center gap-8 lg:w-fit">
            <div className="hidden items-center gap-2 lg:flex">
              <Label htmlFor="rows-per-page" className="text-sm font-medium">
                Rows per page
              </Label>
              <Select
                value={`${table.getState().pagination.pageSize}`}
                onValueChange={(value) => {
                  table.setPageSize(Number(value));
                }}
              >
                <SelectTrigger className="w-20" id="rows-per-page">
                  <SelectValue
                    placeholder={table.getState().pagination.pageSize}
                  />
                </SelectTrigger>
                <SelectContent side="top">
                  {[10, 20, 30, 40, 50].map((pageSize) => (
                    <SelectItem key={pageSize} value={`${pageSize}`}>
                      {pageSize}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>
            <div className="flex w-fit items-center justify-center text-sm font-medium">
              Page {table.getState().pagination.pageIndex + 1} of{" "}
              {table.getPageCount() || 1}
            </div>
            <div className="ml-auto flex items-center gap-2 lg:ml-0">
              <Button
                variant="outline"
                className="hidden size-8 lg:flex"
                size="icon"
                onClick={() => table.setPageIndex(0)}
                disabled={!table.getCanPreviousPage()}
              >
                <span className="sr-only">Go to first page</span>
                <ChevronsLeftIcon />
              </Button>
              <Button
                variant="outline"
                className="size-8"
                size="icon"
                onClick={() => table.previousPage()}
                disabled={!table.getCanPreviousPage()}
              >
                <span className="sr-only">Go to previous page</span>
                <ChevronLeftIcon />
              </Button>
              <Button
                variant="outline"
                className="size-8"
                size="icon"
                onClick={() => table.nextPage()}
                disabled={!table.getCanNextPage()}
              >
                <span className="sr-only">Go to next page</span>
                <ChevronRightIcon />
              </Button>
              <Button
                variant="outline"
                className="hidden size-8 lg:flex"
                size="icon"
                onClick={() => table.setPageIndex(table.getPageCount() - 1)}
                disabled={!table.getCanNextPage()}
              >
                <span className="sr-only">Go to last page</span>
                <ChevronsRightIcon />
              </Button>
            </div>
          </div>
        </div>
      </TabsContent>
      {viewTabs.slice(1).map((tab) => (
        <TabsContent
          key={tab.value}
          value={tab.value}
          className="flex flex-col"
        >
          <div className="aspect-video w-full flex-1 rounded-lg border border-dashed" />
        </TabsContent>
      ))}
    </Tabs>
  );
}